In the summer, the strawberries are in the stage of stolons. They are prone to powdery mildew, brown spot, and leaf spot in rainy weather. The moist soil environment is also conducive to earthworms and harms the root system. In case of dry weather, spider mites, aphids, and other pests are easy. Re-issued, early detection and early prevention and control of production.
The agricultural control prevents the diseased leaves from being burned in time, and the serious strains are removed from the whole plant. Clean the pastoral area, remove the old leaves and yellow leaves, and take them out of the field. Non-raising seedling fields should be timely removed stems, reduce nutrient consumption, enhance plant resistance to disease. Nursery field to control the amount of nitrogen fertilizer, increase phosphorus and potassium fertilizer to prevent plant growth. When it is properly watered in case of drought, the water in the field will be ruled out in time.
Drug control selected sunny morning spray, the front and back of the blade should be sprayed. Disease prevention and control can be used 25% triadimefon WP 3000 times, or 70% thiophanate-methyl WP 1000 times spray. For the control of spider mites and aphids, spray 20% fenvalerate EC 3000 times. In order to find out the harm of cockroach, 90% crystal trichlorfon 30 times liquid 150 ml can be used. Add 5 kg of coixine and mix it to make bait and sprinkle it in the cockroach.
Everything You Need To Know About LED Lighting
LEDs are a simple invention with huge potential to change the lighting industry for the better. Don`t know much about them? Here are three big things you need to know to get your feet under you:
1.What Does LED Stand For?
2.LED stands for light-emitting diode.
A diode is an electrical device or component with two electrodes (an anode and a cathode) through which electricity flows - characteristically in only one direction (in through the anode and out through the cathode). Diodes are generally made from semi-conductive materials such as silicon or selenium - substances that conduct electricity in some circumstances and not in others (e.g. at certain voltages, current levels, or light intensities).
2.A light-emitting diode is a semiconductor device that emits visible light when an electrical current passes through it. It is essentially the opposite of a photo-voltaic cell (a device that converts visible light into electrical current).
Did You Know? There is a similar device to an LED called an IRED (Infrared Emitting Diode). Instead of visible light, IRED devices emit IR energy when electrical current is run through them.
1.How Do LED Lights Work?
2.It`s really simple actually, and very cheap to produce, which is why there was so much excitement when LED lights were first invented!
The p-type and n-type materials are created by introducing the original material to atoms of another element. These new atoms replace some of the previously existing atoms and in so doing, alter the physical and chemical structure. The p-type materials are created using elements (such as boron) that have less valence electrons than the intrinsic material (oftentimes silicon). The n-type materials are created using elements (such as phosphorus) that have more valence electrons that the intrinsic material (oftentimes silicon). The net effect is the creation of a p-n junction with interesting and useful properties for electronic applications. What those properties are exactly depends mostly on the external voltage applied to the circuit (if any) and the direction of current (i.e. which side, the p-type or the n-type, is connected to the positive terminal and which is connected to the negative terminal).
Application of the Technical Details to LED Lighting:
When a light-emitting diode (LED) has a voltage source connected with the positive side on the anode and the negative side on the cathode, current will flow (and light will be emitted, a condition known as forward bias). If the positive and negative ends of the voltage source were inversely connected (positive to the cathode and negative to the anode), current would not flow (a condition known as reverse bias). Forward bias allows current to flow through the LED and in so doing, emits light. Reverse bias prevents current from flowing through the LED (at least up until a certain point where it is unable to keep the current at bay - known as the peak inverse voltage - a point that if reached, will irreversibly damage the device).
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